| Year | Value | | 2022 | 3,715 | | 2021 | 3,646 | | 2020 | 3,588 | | 2019 | 3,530 | | 2018 | 3,468 | | 2017 | 3,390 | | 2016 | 3,280 | | 2015 | 3,122 | | 2014 | 2,924 | | 2013 | 2,691 | | 2012 | 2,440 | | 2011 | 2,211 | | 2010 | 2,030 | | 2009 | 1,927 | | 2008 | 1,912 | | 2007 | 1,948 | | 2006 | 1,988 | | 2005 | 2,009 | | 2004 | 2,004 | | 2003 | 1,969 | | 2002 | 1,914 | | 2001 | 1,852 | | 2000 | 1,780 | | 1999 | 1,697 | | 1998 | 1,619 | | 1997 | 1,559 | | 1996 | 1,513 | | 1995 | 1,474 | | 1994 | 1,444 | | 1993 | 1,405 | | 1992 | 1,334 | | 1991 | 1,233 | | 1990 | 1,138 | | 1989 | 1,054 | | 1988 | 987 | | 1987 | 944 | | 1986 | 917 | | 1985 | 886 | | 1984 | 852 | | 1983 | 818 | | 1982 | 773 | | 1981 | 723 | | 1980 | 681 | | 1979 | 635 | | 1978 | 585 | | 1977 | 547 | | 1976 | 510 | | 1975 | 480 | | 1974 | 453 | | 1973 | 426 | | 1972 | 406 | | 1971 | 390 | | 1970 | 374 | | 1969 | 356 | | 1968 | 340 | | 1967 | 319 | | 1966 | 294 | | 1965 | 275 | | 1964 | 259 | | 1963 | 249 | | 1962 | 244 | | 1961 | 243 | | 1960 | 241 |
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